Yes, ask ("tell") any listserv
 
get listownr refcard
 
 
In your case, you "forgot" the token "for" between "nomail" and
the "userid"
 
Hopefully, you did not end the userid@node with a period.
 
Thus, the command should have been
 
         set MEDLAB-L nomail FOR [log in to unmask]
 
assuming a valid userid@node
 
--  co-owner INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
[log in to unmask] "Right bullet, wrong target" s/me      +1 814 863 1843
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